Tamayama Formation

The Tamayama Formation is a Coniacian-Santonian geologic formation in Japan. Dinosaur remains not referrable to the genus level are among the fossils that have been recovered from the formation.^[1] The lower and middle part of the formation consists of braided river sandstone, while the upper portion consists of upper shoreface to inner shelf sandstone.^[2] Vertebrate taxa from the formation include Futabasaurus and Cretalamna, along with titanosauriform teeth and neosuchian remains. Seeds of the nymphaeales plant Symphaenale futabensis are also known from this formation.

Tamayama Formation
Stratigraphic range: Coniacian–Santonian PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Unit of	Futaba Group
Sub-units	Kohisagawa Member, Irimaza Member
Underlies	Unconformity with the Eocene Iwaki Formation
Overlies	Kasamatsu Formation
Thickness	~ 150 metres
Lithology
Primary	Sandstone
Other	Siltstone
Location
Region	northern Honshu
Country	Japan

Fossils

Paleofauna

• Futabasaurus suzukii
• Cretalamna appendiculata^[3]
• Inoceramus
  • Inoceramus amakusensis^[4]
  • Inoceramus mihoensis^[4]
• Apiotrigonia minor^[3]
• Glycymeris? sp.^[3]
• Archaeromma chisatoi^[5]
• Titanosauriformes indet.^[4]
• Neosuchia indet.^[6]

Paleoflora

• Symphaenale futabensis^[7]
• Esgueiria sp.^[8]
• Hironoia sp.^[9]

See also

• Earth sciences portal
• Paleontology portal
• Dinosaurs portal

• List of dinosaur-bearing rock formations
  • List of stratigraphic units with few dinosaur genera